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    <title>在 inline-style 内联样式中绑定 data 数据</title>
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  <body>
    <div id="app">
      <div>
        <p :style="pStyle">这是一个段落</p>
        <button class="btn" @click="fontSize += 1">A</button>
        <button class="btn" @click="fontSize -= 1">a</button>
      </div>
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